199142939 has 2 divisors, whose sum is σ = 199142940. Its totient is φ = 199142938.

The previous prime is 199142927. The next prime is 199142959. The reversal of 199142939 is 939241991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199142939 - 2²⁰ = 198094363 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 199142893 and 199142902.

It is not a weakly prime, because it can be changed into another prime (199142959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99571469 + 99571470.

It is an arithmetic number, because the mean of its divisors is an integer number (99571470).

Almost surely, 2^199142939 is an apocalyptic number.

199142939 is a deficient number, since it is larger than the sum of its proper divisors (1).

199142939 is an equidigital number, since it uses as much as digits as its factorization.

199142939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 47.

The square root of 199142939 is about 14111.8014087501. The cubic root of 199142939 is about 583.9669976894.

The spelling of 199142939 in words is "one hundred ninety-nine million, one hundred forty-two thousand, nine hundred thirty-nine".